Just for reference's sake, the only one on your list I've listened to is the Bernstein I, which I have a hard time with, actually. The finale somehow doesn't flow at all on that performance, and the first mov is impossibly fast I find. I've been listening to Zinman and Fischer, primarily, as well as Chailly and Levine to a lesser extent. My preliminary sense of the finale, which is becoming more managable after repeated listening, is that it's like the 'can't get started' engine, it's built so as not to build momentum, i.e. the diametrical opposite of the first movement. I suppose that's part of why I was having difficulty w it, as well as the fact that it's especially pessimistic music, something I haven't encountered in Mahler yet (or since). It's certainly unexpected if you know the first movements only, and I'm still unclear as to how they work together, though the common material and references are obvious now. More later.
GB